Student information management system notes python
1. Demand analysis
Should have the function:
- Add student information and grade information
- Save student information in a file
- Modify and delete student information
- Query student information
- Sort by student grade
- Statistics student total score
2. System design
Seven modules of the student information management system
-
Enter student information module
-
Find Student Information
-
delete student information
-
Modify student information
-
Student Achievement Ranking
-
Statistics of the total number of students
-
Show all student information
4. System Implementation
main()
menu()
search()
delete()
modify()
insert()
total()
show()
sort()
Five, package the project to survive the exe file
Install third-party packages
pip install PyInstaller
Open the command line and package the exe
pyinstaller -F “D:\Program Files (x86)\pycharm\PythonProject\studentsys\stusystem.py”
The location marked in red in the picture is the storage location of the exe program.
The location marked in red in the picture is the storage location of the exe program.
6. Code implementation
import os.path
filename = 'students.txt'
def main():
while True:
menu()
choice = int(input('请选择功能'))
if choice in [0, 1, 2, 3, 4, 5, 6, 7]:
if choice == 0:
answer = input('您确定退出系统吗？y/n')
if answer == 'y' or answer == 'Y':
print("欢迎您的使用！！")
break
else:
continue
elif choice == 1:
insert()
elif choice == 2:
search()
elif choice == 3:
delete()
elif choice == 4:
modify()
elif choice == 5:
sort()
elif choice == 6:
total()
elif choice == 7:
show()
input()
def menu():
print('==================学生信息管理系统==============')
print('===============功能菜单==================')
print('\t\t\t1. 录入学生信息')
print('\t\t\t2. 查找学生信息')
print('\t\t\t3. 删除学生信息')
print('\t\t\t4. 修改学生信息')
print('\t\t\t5. 对学生成绩进行排序')
print('\t\t\t6. 统计学生总人数')
print('\t\t\t7. 显示所有学生信息')
print('\t\t\t0. 退出程序')
print('======================================')
def insert():
student_list = []
while True:
id = input("请输入ID：")
if not id:
break
name = input("请输入姓名：")
if not name:
break
try:
english = int(input("请输入英语成绩："))
python = int(input("请输入python成绩："))
java = int(input("请输入Java成绩："))
except:
print("输入无效，请重新输入")
# 将录入的学生信息保存在字典中
student = {
'id': id, 'name': name, 'english': english, 'python': python, 'java': java}
# 将学生信息添加到列表中
student_list.append(student)
answer = input("是否继续添加y/n?")
if answer == 'y':
continue
else:
break
# 调用save函数保存信息
save(student_list)
print("学生信息保存成功")
def save(lst):
try:
stu_txt = open(filename, 'a', encoding='utf-8')
except:
stu_txt = open(filename, 'w', encoding='utf-8')
for item in lst:
stu_txt.write(str(item) + '\n')
stu_txt.close()
def search():
student_query = []
while True:
id = ''
name = ''
if os.path.exists(filename):
mode = input("按ID查找请按1，按姓名查找请按2：")
if mode == '1':
id = input("请输入学生ID：")
elif mode == '2':
name = input("请输入学生新明：")
else:
print("输入有误，请重新输入")
search()
with open(filename, 'r', encoding='utf-8') as file:
student = file.readlines()
for item in student:
d = dict(eval(item))
if id != '':
if d['id'] == id:
student_query.append(d)
elif name != '':
if d['name'] == name:
student_query.append(d)
show_query(student_query)
# 清空列表
student_query.clear()
answer = input("是否继续查询？y/n")
if answer == 'y':
continue
else:
break
else:
print("无学生信息")
return
def show_query(lst):
if len(lst) == 0:
print("无相关信息")
return
# 定义标题显示格式
format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
print(format_title.format('ID', '姓名', '英语成绩', 'python成绩', 'Java成绩', '总成绩'))
# 定义内容显示格式
format_data = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
for item in lst:
print(format_data.format(item.get('id'),
item.get('name'),
item.get('english'),
item.get('english'),
item.get('java'),
int( item.get('english')) + int( item.get('english')) + int( item.get('java'))
))
def delete():
while True:
student_id = input("请输入删除学生的ID：")
if student_id != '':
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8') as file:
student_old = file.readlines()
else:
student_old = []
flag = False
if student_old: # 空列表等于 False，非空列表等于True
with open(filename,'w',encoding='utf-8') as wfile:
# 只用于写入。如果该文件已存在则打开文件，并从开头开始编辑，即原有内容会被删除
d = {
}
for item in student_old:
d = dict(eval(item)) # 将字符串转换为字典
if d['id'] != student_id:
wfile.write(str(d)+'\n')
else:
flag = True
if flag:
print(f'id为{
student_id}的学生信息已被删除')
else:
print(f'没有找到学生ID为{
student_id}的学生')
else:
print("无学生信息")
break
show()
answer = input("是否继续删除？y/n")
if answer == 'y':
continue
else:
break
def modify():
show()
if os.path.exists(filename):
with open(filename, 'r', encoding='utf-8') as file:
student_old = file.readlines()
else:
return
student_id = input("请输入修改学生的ID：")
with open(filename, 'w', encoding='utf-8') as wfile:
for item in student_old:
d = {
}
d = dict(eval(item))
if d['id'] == student_id:
print("已经找到学生信息，请修改相关信息")
while True:
try:
d['name'] = input("请输入姓名")
d['english'] = input("请输入英语成绩")
d['python'] = input("请输入python成绩")
d['java'] = input("请输入Java成绩")
except:
print("输入有误，请重新输入")
else:
break
wfile.write(str(d) + '\n')
print("修改成功")
else:
wfile.write(str(d)+'\n')
answer = input("是否继续修改其他学生信息？y/n")
if answer == 'y':
modify()
else:
return
def sort():
show()
if os.path.exists(filename):
with open(filename, 'r', encoding= 'utf-8') as file:
students = file.readlines()
students_new = []
for item in students:
d = dict(eval(item))
students_new.append(d)
else:
return
# 排序方式
asc_or_desc = input("请选择升序 0 还是降序 1？")
if asc_or_desc == '0':
asc_or_desc_bool = False
elif asc_or_desc == '1':
asc_or_desc_bool = True
else:
print("输入有误，请重新输入")
sort()
mode = input("请选择排序方式(1.英语 2.python 3.Java 4.总成绩)：")
if mode == '1':
students_new.sort(key=lambda x : int(x['english']), reverse=asc_or_desc_bool)
# x 代表列表students_new中的项
elif mode == '2':
students_new.sort(key=lambda x: int(x['python']), reverse=asc_or_desc_bool)
elif mode == '3':
students_new.sort(key=lambda x: int(x['java']), reverse=asc_or_desc_bool)
elif mode == '4':
students_new.sort(key=lambda x: int(x['english']) + int(x['python']) + int(x['java']), reverse=asc_or_desc_bool)
else:
print("输入有误，请重新输入")
show_query(students_new)
def total():
if os.path.exists(filename):
with open(filename, 'r', encoding='utf-8') as file:
students = file.readlines()
if students:
print(f"总共有{
len(students)}名学生")
else:
print("无学生信息")
else:
print("无学生信息")
def show():
student_query = []
if os.path.exists(filename):
with open(filename, 'r', encoding='utf-8') as file:
student = file.readlines()
for item in student:
d = dict(eval(item))
student_query.append(d)
show_query(student_query)
# 清空列表
student_query.clear()
else:
print("无学生信息")
return
if __name__ == '__main__':
main()